The manipulation of easy money against hard money (Bitcoin, gold) doesn't last forever. For how long can they keep pushing the price down? we don't know, but such manipulation doesn't last forever. The demand for Bitcoin isn't going to magically stop, and the amount of Bitcoin is strictly limited. There's enough Bitcoin for everyone, it's just a function of price.
Manipulation is all relative and is something that largely only happens between people's ears. Bitcoin isn't being manipulated down, it's just the speculative nature of this market doing it.
If there was manipulation, then it happens to the up side as well, so if the mad bull run that happened in 2017 was manipulation, we haven't seen anyone complain about that, because people then made money, not lose it.
What I noticed is that while a lot people blindly assume that this market is heavily rigged, no one can actually provide the evidence to back up their claims. Overall, people believe what they want to believe....